Only up to a point, Lord Copper. Storeys, yes: but here in Rightpondia something that gets stuck in your finger and has to be removed with a needle or tweezers is a splinter, not a sliver. Sliver isn’t all that common a word in standard British English, but when used it generally means something cut deliberately into narrow strips (‘I’ll just have a sliver of cheese’) , whereas a splinter is generally an accidental artefact (‘Careful handling those boards, they’re full of splinters’). I can’t answer for dialects, though, where they may have other meanings.

Not all that exaggerated. I’ve met people whose ordinary speech is quite similar to that of the McKenzie brothers. My unscientific sampling tells me that there is a class or education element involved, with the “eh” being more common among those with less schooling. That may also explain why it isn’t heard as often among Canadians abroad, who tend to be wealthier and better educated. It is also subject to code switching. I occasionally hear it in casual conversation among the grad students and faculty here at U of T, but almost never in lecture or other more formal context. That may also explain why it’s not heard abroad.

The “Canadian raising” of vowels is more widespread, doesn’t seem affected by class, and isn’t subject to code switching.

As an SE English Briton, my observations:
Hockey is played on grass. The other one is ice-hockey. This is not just being picky: anybody talking about “hockey” in the UK will be assumed to be talking about the version known in North America as “field hockey” (a fine retronym). Hockey is very popular among the South Asian community in Britain (who are, of course, called just “Asians”. And talking of whom, “Indians”, are, of course, from India.)
Storeys - yes, and “first floor” for the one above the ground floor.
Sliver - no, splinter.
Eavestrough - no, gutter.
Smarties - the ones that look like unlabelled M&Ms.
“When ordering toast at a Canadian restaurant” - um - we don’t order toast in restaurants (and that “at” and “in” looks to be a difference …). We might order toast in a cafe (or caff), to go with fried eggs, sausages and baked beans, in which case “brown or white?” would be a not-unexpected question: similarly we might expect the same question if ordering a sandwich to be made for us in a sandwich shop.
Saying “sorry” to the person who bumped into you - absolutely.
Britons “take” tests and get “marks”.
Bacon is bacon (ie what USians call “back bacon") - the other sort is called “streaky bacon”.
They’re supply teachers.
“Pop” is music. The drinks might have been called “pop” 70 or 80 years ago, but today it’s “soft drinks” or “fizzy drinks”.
Traffic cones are traffic cones.
Our usage of “university” and “college” and the names for poeple in different years looks to be identical to Canadian usage.
However, “1st grade/grade one” would be “Year 2” (we start school with Year 1 at five here ... indeed, most kids today start even earlier than that, in “Reception”, which would be half a day, five days a week, from the age of four ...) and “secondary school” starts at age 11, in the US equivalent of 6th grade.

However, “1st grade/grade one” would be “Year 2” (we start school with Year 1 at five here ... indeed, most kids today start even earlier than that, in “Reception”, which would be half a day, five days a week, from the age of four ...)

A relatively recent “Public School” invention here is K-4 which is kindergarten at 4 years of age--a half day publicly financed program in some cities (perhaps before sequestration). It’s been the bane of many private programs until very recently.

In previous days, Kindergarten (which in Germany where the word comes from is what we would call “day-care") begins at five or so.

The ages are figured in most places by date of birth after September. One could turn 6 in October and enter Kindergarten.

Bacon is bacon (ie what USians call “back bacon") - the other sort is called “streaky bacon”.

As a Londoner born (in 1956) and bred, I beg to differ. The unqualified word ‘bacon’, to me, refers equally to all cuts of bacon - back, streaky and collar - either smoked or unsmoked. I would certainly not assume one cut or cure rather than another; if you wanted me to grill you some back bacon for your breakfast rather than streaky, you’d have to specify; if you just asked for ‘bacon’, you might get any cut.

In some two-syllable words where the vowel sound in the first syllable is an A, it is pronounced like the A in “apple,” not as in “father.” This includes words like pasta (PA-sta), data (DA-tuh), bagel (BAG-ull), basil (BAZZ-ull).

It’s on page 5 of the linked article in Dave’s OP, in The Letter A entry.

Someone asks why the letter H in herb is not silent in Canada. It used to be silent in the UK, and in fact I still pronounce it thus, but, as with hotel, the H has become sounded over the last 50 years or so.

Whoever it is, it’s someone with ideas of pronunciation which are very foreign to me. I’ve always pronounced “data” DAY-ta, “bagel” BAY-gel, “basil” as Mrs. Fawlty says it, and “pasta” (not very accurately) as a modern Roman would pronounce “pasta”. I know people who say Basil as in Hazel, and Data as in Garter, or as in Hatter; that’s their own affair. But anyone who says “Bagel” as in “Waggle” needs his/her ears cleaned out (or alternatively, might need some lessons in typing).